CVE-2026-93872: Cotonti

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

Cotonti 1.0.0 passes the base64-decoded cb parameter to unserialize() without allowed_classes restriction in the comments plugin EditAction. Registered users with comment write permissions can instantiate arbitrary PHP objects and potentially achieve file write or code execution through gadget chains.

Affected products

• Cotonti Cotonti: from 1.0.0, up to and including 1.0.0

Published 2026-09-18. Last modified 2026-09-22.